dataframe nan inf

1. 檢測 有如下dataframe，先用df.isnull().sum()檢查下哪一列有多少NaN: import pandas as pd df = pd.DataFrame({'a':[None,1,2,3],'b':[4,None,None,6],'c':[1,2,1,2],'d':[7,7,9,2]}) print (df) print (df.isnull().sum()) 輸出： 

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